I would not let MT2 tooling scare me away from that Clausing mill if you are truly interested in a mill of that size. About the only thing that I cannot do with mine is mount a 90° head to it as there are none that are commercially available for MT2. I have collets up to 1/2", drill chucks, boring heads, fly cutters, a face mill, and a 1" stub arbor for horizontal milling cutters for mine and they all work great.
As for the 90° head, I was contemplating building one, and even have the plans drawn up, but never followed though with building one after I purchased my horizontal mill.